[aikah]

> I have no idea how something like this was generated.

It would be interesting to ask the sender how .

> If the file is small enough or the data regular enough, you could fix it by hand with some search & replace.

off course.

> But the file I had was gigabytes in size and most of it looked fine.

I suspect a faulty JSON library, it's important to figure out how it was generated so an eventual issue can be opened and the bug can be fixed.